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5509 = 7787
BaseRepresentation
bin1010110000101
321120001
41112011
5134014
641301
722030
oct12605
97501
105509
114159
123231
13267a
142017
151974
hex1585

5509 has 4 divisors (see below), whose sum is σ = 6304. Its totient is φ = 4716.

The previous prime is 5507. The next prime is 5519. The reversal of 5509 is 9055.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9055 = 51811.

It is a cyclic number.

It is not a de Polignac number, because 5509 - 21 = 5507 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387 + ... + 400.

It is an arithmetic number, because the mean of its divisors is an integer number (1576).

25509 is an apocalyptic number.

It is an amenable number.

5509 is a deficient number, since it is larger than the sum of its proper divisors (795).

5509 is an equidigital number, since it uses as much as digits as its factorization.

5509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 5509 is about 74.2226380561. Note that the first 3 decimals coincide. The cubic root of 5509 is about 17.6613646524.

Multiplying 5509 by its product of nonzero digits (225), we get a triangular number (1239525 = T1574).

It can be divided in two parts, 550 and 9, that multiplied together give a triangular number (4950 = T99).

The spelling of 5509 in words is "five thousand, five hundred nine".

Divisors: 1 7 787 5509